cf. [1]}.
When \(J\partial _x + K_\pm = -d^2\mathcal {A}^\epsilon _{\text{CR}}(w_\pm )\)  we define the relative Morse index \(i(w_-,w_+)\)  of \(w_-\)  and \(w_+\)  as
the Fredholm index
\(i(w_-,w_+) \,\stackrel{\mbox{\tiny \textnormal {\raisebox {0ex}[0ex][0ex]{def}}}}{=}\,\iota (K_-,K_+) ,\) 
